磁种磁团聚强化淀粉对微细粒赤铁矿的抑制

针对赤铁矿反浮选过程中，淀粉对微细粒赤铁矿抑制作用较差的问题，通过浮选试验、EDLVO理论计算、粒度分布和SEM分析，研究了利用磁种磁团聚强化淀粉对微细粒赤铁矿的抑制作用.结果表明，随着赤铁矿的粒度降低，淀粉对赤铁矿的抑制作用变差.添加磁铁矿可强化淀粉对微细粒赤铁矿的抑制作用，随着磁铁矿粒度的增加，强化抑制作用越明显.不同粒级的磁铁矿与微细粒赤铁矿间均存在引力作用，可使磁铁矿与赤铁矿发生磁团聚，且磁铁矿粒度越大，引力作用越强.磁团聚作用增加了微细粒赤铁矿的表观粒度，从而强化了淀粉对微细粒赤铁矿的抑制作用.

Depression of Starch on Fine Hematite Enhanced with Magnetic Seeding Aggregation

The depression effect of starch on fine hematite is poor during the reverse flotation of hematite. Flotation tests， EDLVO calculations， particle size analysis and SEM analysis were used to investigate the depression effect of starch on fine hematite with the assistance of magnetic seeding aggregation. The results showed that the depression effect of starch on hematite decreased with the decrease of hematite particle size. The addition of magnetite enhanced the depression effect， which became more obvious with the increase of magnetite particle size. The attraction between magnetite of different sizes and fine hematite leads to the aggregation of magnetite with hematite particles， and the larger the particle size of magnetite， the stronger the attraction is. The magnetic seeding aggregation increased the apparent particle size of fine hematite， thus strengthened the depression effect of starch on hematite.